the outgoing pentagon chief set to lift the two decades' old ban on women serving on the front lines. plus, after months of delays, secretary clinton testifies on bernanke. -- benghazi. >> we had no doubt there were terrorists militants they killed our people. >> we were mislead there were supposedly protests and something sprang out of that, an assault sprang out of that. >> with all due respect, the fact is we had four dead americans. was it because of a protest or guys out for a walk one night who decided they would go kill some americans. what the difference at this point does it make? >> shepard: secretary clintons testifying for the first time about the attack in libya. and facing fierce criticism. >> i'm glad that you're accepting responsibility. i think that ultimately with your leaving you accept the culpability for the worse tragedy since 9/11. i really mean that. >> shepard: tonight, her responses, the emotional moments. >> i put my arms around the mothers and fathers, the sisters and brothers and sons and daughters. >> shepard: and what we still do not know about the attack in